It’s possible that FooSales is being permanently or temporarily blocked from connecting to your website. This might be due to a security plugin or your website hosting company blocking access.
If you have a security related plugin installed on your website such as Wordfence, please temporarily disable it and try to connect to the FooSales app again. If you are able to connect, then the plugin was blocking access and will need to be permanently disabled or configured differently.
You can also ask your hosting company to confirm that there are no security restrictions on the ‘xmlrpc.php’ file which is part of WordPress and advise if the IP address of your device has been blocked from connecting to your site.
If you still experience any issues, please contact FooSales Technical Support and include as much detail as possible so we can get back to you with other possible solutions.